*{
    margin: 0;
    padding: 0;
    list-style:none;
}
body,html{
    width: 100%;
    height: 100%;
}
body{
    position: relative;
    background-image: url(../images/yinyuehui_guanzhong-007\ \(1\).jpg);
    background-size:100% 100%;
}
.box{
    float: left;
    position: absolute;
 width: 100%;
 height: 90px;
 display: flex;
  top: 50%;
  transform: translateY(-50%);
justify-content: space-around;
 align-items: center;
  li{
      cursor: pointer;
      font-family:'Courier New', Courier, monospace;
        width: 90px;
        height: 100%;
        transition: all 100ms;
        text-align: center;
        line-height: 90px;
        font-weight: bold;
        font-size: 30px;
        color: white;
        border-radius: 5px;
        border: 5px solid black;

  }       
}